Water-sand blast gun



Feb. 23, 1937. c. FLETCHER 2,071,472

WATER-SAND BLAST GUN Filed Oct. 26, 1936 I 2 Sheets-Sheet 1 w irPatented Feb. 23, 1937 UNITED STATES PATENT OFFICE aliff 23313;...

Application October-26, 1936, Serial No. 107,704 5 Claims. (01.51-11)This invention relates to a blast gun, and more particularly to thattype of gun designed for blasting with abrasive in which a liquid, suchas water, is employed, and an object of the invention is to provide agun characterized by such an arrangement of parts that the water issuingfrom the gun in a stream forms, as it were, an encasing wall or jacketfor the sand as it issues from the gun, the object, intent and purposebeing to increase the cleaning action and to keep the sand dry until itstrikes the surface being cleaned, at which time it mixes with thewater, thereby eliminating dust as would otherwise'occur; the waterfurther acting to carry the sand against the surface to be cleaned.

The invention, together with its objects and advantages will be bestunderstood from a study of the following description taken in connectionwith the accompanying drawings wherein:--

Figure 1 is a sectional viewthrough the gun.

Figs. 2, 3 and 4 are sectional views taken substantially on the lines2-2, 3--3, and 4-4 respectively of Fig. 1.

Fig. 5 is a side elevational view of the gun.

Fig. 6 is a detail sectional view of a shut-off valve and Fig. 7 is asectional view through what may be termed a transposition unit.

Referring more in detail to the drawings, it will be seen that the guncomprises a barrel 5 having integral therewith a hollow tubular handleportion 6, internally threaded as at I for the coupling of one end of awater hose or the like thereto.

Barrel 5 is chambered so as to provide a chamher 8 into which opens thebore or conduit 9 of the handle 6.

Also at one end of the chamber, the barrel 5 is internally threaded asat I0 to receive a removable externally threaded valve seat ll.Cooperable with the valve seat II is a conical valve member l2 of anysuitable material and secured through the medium of a screw or similarfastening element l3 to the head H of a valve stem l5.

Valve stem l5 works through a suitable packing arranged in the barrel 5and consisting of suitable packing material 16 confined between a pairof packing disks l'l.

The packing l6 and disks I! are held in position through the medium ofan internal shoulder l8 and a gland nut [9, the latter being threadedinto one end of the barrel 5 as clearly shown in Fi 1.

The gland nut I9 is provided with a threaded bore 20 complemental tothreads 2| provided on a section of the stem 15 and cooperable therewithfor securing the valve 12 at the desired ad justment relative to theseat ll.

At the discharge end of the barrel 5 there is provided what may betermed a transposition unit indicated generally by the reference numeral22.

The unit 22 as will be clear from a study of Figs. 1 and '7 comprises. asubstantially cylindrical body member 23 having a diametrically 10enlarged socket end 24 fitting snugly within a socket 25 provided inthat end ,of the barrel 5 remote from the gland nut l9.

At its opposite end, the body 23 presents a threaded part 26, a shoulder21, and a jet pas- 1.

sage 28. I

Sleeved on the passage extension 28 is anipple 29 that has an externallythreaded diametrically enlarged end 30 that is screw ntothe threadedsection 26 of bod eor A coupling sleeve..3l has one end 32fs'crewthreaded onto the socket'equipped'end of the barrel 5 while itsrelatively oppositeend is provided with an inturned flange 33'whichengages behind a shoulder 34 on the nipple'29, asshown 25 in Fig. 1 forholding the transposition unit in place on the discharge end of the,barrel 5. p

The body 23 has a plurality, in the present instance, four passages 36extending through the same from the socket 24 for communicating the .30socket 24 with a chamber 31 provided in the nipple 29. Nipple 29 alsohas a 'plurality, in the present instance, for passages 38 therethroughthat extendfrom the chamber. 'as best shown in Fig. 1. f I, It willthusbe seen that waterentering'the chamber 28 will under pressure, withvalve l2, in

an open or unseated position, pass from the chamber 8 into the socketorchamber 24 and through thepassages 36 to the chamber 3! dischargingfrom the chamber 31 through the passages 38 and through a nozzle 39threaded on one end of the nipple 29, onto the surface to be cleaned. 45Intermediate its respective opposite ends, the body member '23 of thetransposition unit is grooved or otherwise circumferentially reduced,while the coupling sleeve 3| interrnediateits ends is internally groovedto mate withthe 5o grooved or circumferentiallyfreduced portion of thebody 23, in a manner t provide therewith a suction or vacuum chamber '40surrounding the body member 23. At the aforementioned groove portionthereof, thefcoupling sleeve 3|.

vided with an internally threaded neck 4| which receives one end of acoupling nipple 42, the other end of which nipple is suitably engagedwith or inserted into one end of a hose 43, lead- 5 ing from a source ofsand supply.

The body member 22 also is provided with a plurality of diagonalpassages 43 that connect or communicate the chamber 40 with the passage2! of said unit.

Thus it will be seen that the water discharging through the nozzle 29will create at the discharge end of the passage 28 a suction sumcient todraw the sand fed to the chamber 40 through the medium of the pipes 43,from a source of supply,

through the passages 43, the passage 28, to discharge from the gunthrough the nozzle 39 in the center of the somewhat cylindrical waterstream issuing from the gun. Thus it will be seen that through themedium of this construction, the water issues from the gun in asubstantially tubular stream with the sand also issuing from the gunwithin the confines of the water stream, so that the water stream formsas it were and an encasing jacket for the sand. As a result the sandremains practically dry until it strikes the surface being cleaned whenit mixes with the water. In this way flying sand dust is reduced to aminimum if not entirely eliminated.

In actual practice it will be found that the dry sand hitting thesurface to be cleaned cleans the surface more quickly and thoroughlythan where the sand and water mixed together strikes the surface to becleaned. Also by reason of the gun construction involving the subjectmatter of the invention, this manner of feeding the water and sand willresult in the water cushioning the sand and otherwise provides for abetter cleaning action than heretofore obtained by known and used sandblast gun constructions.

It is thought that a clear understanding of the construction, utilityand advantages of an invention of this character will be had without amore detailed description.

Having thus described the invention, what is claimed as new is:

1. In a sand blast gun, a barrel provided with a chamber and a handlefor the barrel having a water passage therethrough for supplying waterto said chamber, a body member mounted on one end of the gun andprovided at one end with a socket and a relatively opposite end with ahollow tubular extension providing a discharge passage, and a circularseries of relatively spaced passages extending through said body fromthe 65 socket end thereof, a valve arranged in the barrel between saidwater chamber and the socket end of said body and controlling thepassage of water from said chamber into said socket, the water passingfrom said socket through said 60 series of passages to create a suctionat the open end of said tubular extension, a nipple sleeved on thetubular extension of said body member and provided with a chamber and acircular series of relatively spaced passages leading from said chamberlongitudinally through said nipple circumjacent the tubular extension,9. member surrounding said body and providing therewith a sand chamberand also having an inlet for said sand chamber, and said member beingprovided 70 with diagonal passages connecting the sand chamber with saidtubular extension whereby the sand will be drawn from said sand chamberthrough said diagonal passages and into said tubular extension todischarge therefrom within 75 the confines of the stream of waterissuing from the nipple through the aforementioned passages in saidnipple.

2. In a sand blast gun, a barrel provided with a chamber and a handlefor the barrel having a water passage therethrough for supplying waterto said chamber, a body member mounted on one end of the gun andprovided at one end with a socket and a relatively opposite end with ahollow tubular extension providing a discharge passage, and a circularseries of. relatively spaced passages extending through said body fromthe socket end thereof, a valve arranged in the barrel between saidwater chamber and the socket end of said body and controlling thepassage of water from said chamber into said socket, the water passingfrom said socket through said series of passages to create a suction atthe open end of said tubular extension, a nipple sleeved on the tubularextension of said body member and provided with a chamber and a circularseries of relatively spaced passages leading from said chamberlongitudinally through said nipple circumjacent the tubular extension, amember surrounding said body and providing therewith a sand chamber andalso having an inlet for said sand chamber, and said member beingprovided with diagonal passages connecting the sand chamber with saidtubular extension whereby the sand will be drawn from said sand chamberthrough said diagonal passages and into said tubular extension todischarge therefrom within the confines of the stream of water issuingfrom the nipple through the aforementioned passages in said nipple, anda nozzle member threaded on said nipple.

3. In a sand blast gun, a barrel provided with a chamber and a handlefor the barrel having a water passage therethrough for supplying waterto said chamber, a body member mounted on one end of the gun andprovided at one end with a socket and a relatively opposite end with ahollow tubular extension providing a discharge passage, and a circularseries of relatively spaced passages extending through said body fromthe socket end thereof, a valve arranged in the barrel between saidwater chamber and the socket end of said body and controlling thepassage of water from said chamber into said socket, the water passingfrom said socket through said series of passages to create a. suction atthe open end of said tubular extension, a nipple sleeved on the tubularextension of said body member and provided with a chamber and a circularseries of relatively spaced passages leading from said chamberlongitudinally through said nipple circumjacent the tubular extension, amember surrounding said body and providing therewith a sand chamber andalso having an inlet for said sand chamber, and said member beingprovided with diagonal passages connecting the sand chamber with saidtubular extension whereby the sand will be drawn from said sand chamberthrough said diagonal passages and into said tubular extension todischarge therefrom within the confines of the stream of water issuingfrom the nipple through the aforementioned passages in said nipple, anozzle member threaded on said nipple, and the member surrounding saidbody -member having one end threaded on the gun barrel and the secondend provided with a flange engaging said nipple whereby said memberserves as a coupling for retaining said body member and said nippletogether with said nozzle on one end of the gun barrel.

4. In a sand blast gun, a barrel provided with a chamber and a handlefor the barrel having a water passage therethrough for supplying waterto said chamber, a body member mounted on one end of the gun andprovided at one end with a socket and a relatively .opposite end with ahollow tubular extension providing a discharge passage, and a circularseries of relatively spaced passages extending through said body fromthe socket end thereof, a valve arranged in the barrel between saidwater chamber and the socket end of said body and controlling thepassage of water from said chamber into said socket, the water passingfrom said socket through said series of passages to create a suction atthe open end of. said tubular extension, a nipple sleeved on the tubularextension of saidbody member and provided with a chamber and a circularseries of relatively spaced passages leading from said chamberlongitudinally through said nipple circumjacent the tubular extension, amember surrounding said body and providing therewith a sand chamber andalso having an inlet for said sand chamber, said member being providedwith diagonal passages connecting the sand chamber with said tubularextension whereby the sand will be drawn from said sand chamber throughsaid diagonal passages and into said tubular extension to dischargetherefrom within the conflnes of the stream of water issuing from thenipple through the aforementioned passages in said nipple, and saidvalve means. including a removable valve seat positioned in the barrelbetween said chamber and the socket end of the first mentioned member,a. packing secured within one end 01 the barrel. and including a glandnut having an internally threaded bore, and a valve engaging said seatand having a stem extending through the packing and the bore of thegland nut, said stem being provided with a section threaded complementalto the threads of said packing for cooperation therewith whereby saidvalve may be secured at the desired position of adjustment relative tothe valve seat.

5. In; a Sand blast gun, a barrel provided with a chamber and a handlefor the barrel having a water passage therethrough for supplying waterto said chamber, a body member mounted at one end of the gun andprovided at one end with a socket and a relatively opposite endwith ahollow tubular extension providing a discharge passage, and a circularseries of relatively spaced passages extending through said body fromthe socket end thereof, a valve arranged in the barrel between saidwater chamber and the socket end of said body and controlling thepassage of water from said chamber into said socket, the water passingfrom said socket through said series of passages to create a suction atthe open end of said tubular extension, a nipple sleeved on the tubularextension of said body member and provided with a chamber and a circularseries or relatively spaced passages leading from said chamberlongitudinally through said nipple circumjacent the tubular extension, amember surrounding said body and providing therewith a sand chamber andalso having an inlet for said sand chamber, said member being providedwith diagonal passages connecting the sand chamber with said tubularextension whereby the sand will be drawn from said sand chamber throughsaid diagonal passages and into said tubular extension to dischargetherefrom within the confines of the stream of water issuing from thenipple through the aforementioned passages in said nipple, and saidbarrel means including a removable valve seat positioned in the barrelbetween said chamber and the socket end of the first mentioned chamber,a packing secured within one end of the barrel and including a gland nuthaving an internally threaded bore, a valve engaging said seat andhaving a stem extending through the packing and the bore of the glandnut, said stem being provided with a section threadedcomplemental to thethreads of said nut for cooperation therewith whereby said valve may besecured at the desired position of. adjustment relative to the valveseat, and said handle being provided at the free end thereof for thecoupling 01 a hose thereto.

CLARENCE FLETCHER.

